Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db4990812925d85…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 08:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 639492332c3fc32a8044a30e3631e89d SHA-1: eae25eb986b52054f9f137328ec2183066c9953e SHA-256: 9db4990812925d85da384946f7078f57b253ee421a84d614c6cb270932a59da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://daonshop.com/files/fckeditor/file/7806829680.pdf
    • http://mkngsp.ru/upload/files/12419082283.pdf
    • https://argumentua.com/i/file/19579186369.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/39145873206.pdf
    • http://jmapilani.org/userfiles/file/fofivitevinojasef.pdf
    • http://sungwoo-n.com/userfiles/file/jopoxozebezofef.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/menefixosisujikumi.pdf
    • http://massageindex.nl/images/uploads/labigitowotem.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d27141d3e0---12635253533.pdf
    • http://bbbo.handyfriendship.com/upload/files/ruruxufuwid.pdf
    • https://newtech-utm.pl/userfiles/file/79980827225.pdf
    • https://fruitssupplier.com/app/webroot/img/files/jotadupufur.pdf
    • http://mylivediamondinventory.com/uploads/files/zomupezijeb.pdf
    • https://girl0229960192.com/upload/users/files/difakezamofe.pdf
    • http://carrozzeriardue.it/userfiles/files/redixoperikalazul.pdf
    • http://barcelonasixtytwo.com/userfiles/file/wupalepoxi.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/29836386193.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0c733bdd653076b0843feeb9e0b9ecd5/xetipifejifuz.pdf
    • http://marketingnews.fr/images/file/sefujitulugiwanitetari.pdf
    • http://hvezda-pardubice.cz/files/file/wureteja.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbc5106c6---jijufozam.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pv2g7gvf2n2fvuebg2adovm5l1/putupu.pdf
    • https://campermagazine.tv/public/file/53830659779.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b98cd0fc5---rirawadukujevivomane.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+your+pictures+from+android+to+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b39c.bin
9cb4b4e0153f265b6102b17836cc2853c3e53f1bd94124ff9863ad680938f78c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 16188 bytes
font_01_sfnt_off0000dc73.bin
f77e15c11f1b39024c2bbb6374a78cb95971ce00c095658195c68a582135f4c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 11132 bytes
font_02_sfnt_off0000f64f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16792 bytes